Not particularly affective until after Pearl Harbor, the USA had been using pro war propaganda ever sense the war began. The people did not want to fight so soon after ww1, until it became personal. As the war began in earnest, America increased the flood of propaganda, especially by using the radio and visual media, specifically, posters. America was able to produce some of the most effective propaganda in ww2 and in history. They helped I pushing up production and conservation, possibly playing a major role in our victory.

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